65750365807681 has 2 divisors, whose sum is σ = 65750365807682. Its totient is φ = 65750365807680.

The previous prime is 65750365807583. The next prime is 65750365807813. The reversal of 65750365807681 is 18670856305756.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54087567080625 + 11662798727056 = 7354425^2 + 3415084^2 .

It is a cyclic number.

It is not a de Polignac number, because 65750365807681 - 2¹¹ = 65750365805633 is a prime.

It is a super-2 number, since 2×65750365807681² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65750365807981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32875182903840 + 32875182903841.

It is an arithmetic number, because the mean of its divisors is an integer number (32875182903841).

Almost surely, 2^{65750365807681} is an apocalyptic number.

It is an amenable number.

65750365807681 is a deficient number, since it is larger than the sum of its proper divisors (1).

65750365807681 is an equidigital number, since it uses as much as digits as its factorization.

65750365807681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016000, while the sum is 67.

The spelling of 65750365807681 in words is "sixty-five trillion, seven hundred fifty billion, three hundred sixty-five million, eight hundred seven thousand, six hundred eighty-one".